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Can the lens mount ring (the EF mount ring with the red dot) actually be removed without having to remove the front panel by just removing the four screws? Or does one actually have to disassemble the whole camera as shown in this guide?

The ribbon connector indicated in orange has a lever on the back of the connector that you lift with the spudger to release the cable. Then reinsert the cable until you feel it hit home and close the lever.

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Repairability

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It's time to speak out for your right to repair

We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.

Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!